Function and efficacy of shoulder and neck massager: 1. Relieve muscle tension: help relax stiff muscles in the shoulder and neck position, relieve muscle strings, spasms and other states. 2. Improve local circulation: promote the blood and lymph flow in the shoulder and neck position, and help metabolic waste discharge. 3. Reduce pain: It can relieve shoulder and neck pain and discomfort caused by muscle tension and strain. 4. Relieve fatigue: effectively eliminate the fatigue of the shoulder and neck, making people feel relaxed and comfortable. 5. Improve sleep: After relaxing the body, it may improve the quality of sleep to some extent. 6. Exercise recovery: hot compress massage after exercise can restore physical strength and improve subsequent exercise performance. 7. Disease prevention: To a certain extent, it helps to prevent the further development of shoulder and neck diseases.